Display screen with an icon



FIG. 1 is a front view of a display screen with an icon;

FIG. 2 is a front view of a second embodiment thereof; and,

FIG. 3 is a front view of a third embodiment thereof.

The broken lines surrounding each of the icons in the drawing illustrate a display screen and form no part of the claimed design. 

CLAIM I claim the ornamental design for a display screen with an icon, as shown and described. 